bandedsamplemodel.java

JAVA基本类源代码,大家可以学习学习!

     * BandedSampleModel <code>bsm2</code>.
     * The transfer will generally be more efficient than using
     * getPixel/setPixel.
     * <pre>
     * 	     BandedSampleModel bsm1, bsm2;
     *	     DataBufferInt db1, db2;
     * 	     bsm2.setDataElements(x, y, bsm1.getDataElements(x, y, null, db1),
     *                            db2);
     * </pre>
     * Using getDataElements/setDataElements to transfer between two
     * DataBuffer/SampleModel pairs is legitimate if the SampleModels have
     * the same number of bands, corresponding bands have the same number of
     * bits per sample, and the TransferTypes are the same.
     * <p>
     * obj must be a primitive array of type TransferType.  Otherwise,
     * a ClassCastException is thrown.  An
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds, or if obj is not large enough to hold the pixel data.
     * @param x,&nbsp;y The coordinates of the pixel location
     * @param obj       If non-null, returns the primitive array in this
     *                  object
     * @param data      The DataBuffer containing the image data
     * @see #getDataElements(int, int, Object, DataBuffer)
     */
    public void setDataElements(int x, int y, Object obj, DataBuffer data) {
        if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
	int type = getTransferType();
	int numDataElems = getNumDataElements();
	int pixelOffset = y*scanlineStride + x;

	switch(type) {

	case DataBuffer.TYPE_BYTE:

	    byte[] barray = (byte[])obj;

	    for (int i=0; i<numDataElems; i++) {
		data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
			     barray[i] & 0xff);
	    }
	    break;

	case DataBuffer.TYPE_USHORT:
        case DataBuffer.TYPE_SHORT:
            
	    short[] sarray = (short[])obj;

	    for (int i=0; i<numDataElems; i++) {
		data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
			     sarray[i] & 0xffff);
	    }
	    break;

	case DataBuffer.TYPE_INT:

	    int[] iarray = (int[])obj;

	    for (int i=0; i<numDataElems; i++) {
		data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
                             iarray[i]);
	    }
	    break;

	case DataBuffer.TYPE_FLOAT:

	    float[] farray = (float[])obj;

	    for (int i=0; i<numDataElems; i++) {
		data.setElemFloat(bankIndices[i], pixelOffset + bandOffsets[i],
                                  farray[i]);
	    }
	    break;

	case DataBuffer.TYPE_DOUBLE:

	    double[] darray = (double[])obj;

	    for (int i=0; i<numDataElems; i++) {
		data.setElemDouble(bankIndices[i], pixelOffset + bandOffsets[i],
                                   darray[i]);
	    }
	    break;

	}
    }

    /**
     * Sets a pixel in the DataBuffer using an int array of samples for input.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the pixel location
     * @param iArray    The input samples in an int array
     * @param data      The DataBuffer containing the image data
     * @see #getPixel(int, int, int[], DataBuffer)
     */
    public void setPixel(int x, int y, int iArray[], DataBuffer data) {
        if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
       int pixelOffset = y*scanlineStride + x;
       for (int i=0; i<numBands; i++) {
           data.setElem(bankIndices[i], pixelOffset + bandOffsets[i],
                        iArray[i]);
       }
    }

    /**
     * Sets all samples for a rectangle of pixels from an int array containing
     * one sample per array element.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the upper left pixel location
     * @param w         The width of the pixel rectangle
     * @param h         The height of the pixel rectangle
     * @param iArray    The input samples in an int array
     * @param data      The DataBuffer containing the image data
     * @see #getPixels(int, int, int, int, int[], DataBuffer)
     */
    public void setPixels(int x, int y, int w, int h,
                          int iArray[], DataBuffer data) {
        if ((x < 0) || (y < 0) || (x + w > width) || (y + h > height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }

        for (int k = 0; k < numBands; k++) {
            int lineOffset = y*scanlineStride + x + bandOffsets[k];
            int srcOffset = k;
            int bank = bankIndices[k];

            for (int i = 0; i < h; i++) {
                int pixelOffset = lineOffset;
                for (int j = 0; j < w; j++) {
                    data.setElem(bank, pixelOffset++, iArray[srcOffset]);
                    srcOffset += numBands;
                }
                lineOffset += scanlineStride;
           }
        }
    }

    /**
     * Sets a sample in the specified band for the pixel located at (x,y)
     * in the DataBuffer using an int for input.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the pixel location
     * @param b         The band to set
     * @param s         The input sample as an int
     * @param data      The DataBuffer containing the image data
     * @see #getSample(int, int, int, DataBuffer)
     */
    public void setSample(int x, int y, int b, int s,
                          DataBuffer data) {
        // Bounds check for 'b' will be performed automatically
        if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
        data.setElem(bankIndices[b],
                     y*scanlineStride + x + bandOffsets[b], s);
    }

    /**
     * Sets a sample in the specified band for the pixel located at (x,y)
     * in the DataBuffer using a float for input.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the pixel location
     * @param b         The band to set
     * @param s         The input sample as a float
     * @param data      The DataBuffer containing the image data
     * @see #getSample(int, int, int, DataBuffer)
     */
    public void setSample(int x, int y, int b,
			  float s ,
			  DataBuffer data) {
        // Bounds check for 'b' will be performed automatically
        if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
        data.setElemFloat(bankIndices[b],
                          y*scanlineStride + x + bandOffsets[b], s);
    }

    /**
     * Sets a sample in the specified band for the pixel located at (x,y)
     * in the DataBuffer using a double for input.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the pixel location
     * @param b         The band to set  
     * @param s         The input sample as a double
     * @param data      The DataBuffer containing the image data
     * @see #getSample(int, int, int, DataBuffer)
     */
    public void setSample(int x, int y, int b,
			  double s,
			  DataBuffer data) {
        // Bounds check for 'b' will be performed automatically
        if ((x < 0) || (y < 0) || (x >= width) || (y >= height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
        data.setElemDouble(bankIndices[b],
                          y*scanlineStride + x + bandOffsets[b], s);
    }

    /**
     * Sets the samples in the specified band for the specified rectangle
     * of pixels from an int array containing one sample per data array element.
     * ArrayIndexOutOfBoundsException may be thrown if the coordinates are
     * not in bounds.
     * @param x,&nbsp;y The coordinates of the upper left pixel location
     * @param w         The width of the pixel rectangle
     * @param h         The height of the pixel rectangle
     * @param b         The band to set
     * @param iArray    The input sample array
     * @param data      The DataBuffer containing the image data
     * @see #getSamples(int, int, int, int, int, int[], DataBuffer)
     */
    public void setSamples(int x, int y, int w, int h, int b,
                           int iArray[], DataBuffer data) {
        // Bounds check for 'b' will be performed automatically
        if ((x < 0) || (y < 0) || (x + w > width) || (y + h > height)) {
            throw new ArrayIndexOutOfBoundsException
                ("Coordinate out of bounds!");
        }
        int lineOffset = y*scanlineStride + x + bandOffsets[b];
        int srcOffset = 0;
	int bank = bankIndices[b];

        for (int i = 0; i < h; i++) {
           int sampleOffset = lineOffset;
           for (int j = 0; j < w; j++) {
              data.setElem(bank, sampleOffset++, iArray[srcOffset++]);
           }
           lineOffset += scanlineStride;
        }
    }

    private static int[] createOffsetArray(int numBands) {
        int[] bandOffsets = new int[numBands];
        for (int i=0; i < numBands; i++) {
            bandOffsets[i] = 0;
        }
        return bandOffsets;
    }

    private static int[] createIndicesArray(int numBands) {
        int[] bankIndices = new int[numBands];
        for (int i=0; i < numBands; i++) {
            bankIndices[i] = i;
        }
        return bankIndices;
    }

    // Differentiate hash code from other ComponentSampleModel subclasses
    public int hashCode() {
        return super.hashCode() ^ 0x2;
    }
}